Foe elevators



(No Model.) 7

A. A. WILDER.

SAFETY ATTACHMENT AND GOVERNOR'POR ELEVATORS. No. 248,539. Patented Oct. 18,1881. 1 O/' .4..

NITED STATES PATENT OFFICE.

ARETUS A. IVILDER, OF DETROIT, MICHIGAN, ASSIGNOR, OF ONE-HALF TO OORYDON B. PALMER, OF SAME PLACE.

SAFETY ATTACHMENT AND GOVERNOR FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 248,539, dated October 18, 1881,

Application filed September 27, 1881. (N model.)

To all whom it may concern Be it known that I, ARETUs A. WILDER, of Detroit, county oflVayne, and State of Michigan, have invented a new and usefullmprovementin SafetyAttachments and Governors for Elevators; and I declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings,

which form a part of this specification.

My invention consists in the combinations of devices and appliances hereinafter set forth, and more particularly specified in the claims.

In the drawings, Figure 1 is a view of my apparatus as applied to an elevator. Fig. 2 is a separate view of the liquid and gear chamber with the face-plate removed. Fig. 3 is a side view of my invention. Fig. 4 is a view of the inside of the gear, showing the method of stopping the free run of the cog.

The object of my invention is to provide a simple and reliable governor and safety attachment for elevators and other similar vehi- 2 cles, which are liable, by becoming detached from their hoisting appliances, to fall or descend too rapidly for the safety of the passengers or freight that is being hoisted.

A represents an elevator; B, the rack-bar,

Q fastened to the sides of the well, through which the elevator passes for the purpose of en gaging with the gear-wheel F.

D is a pinion journalcd in a chamber, D D is apiuion, also journaled in D situatediu 3 5 such a position as to mesh closely with pinion D. Keyed to the center of pinion D is a shaft, E, which runs out through the chamber D and at its end isfixed the cog orpinion F. The inside of the chamber D may or may not be packed on the faces, so as to make a tightjoint where the pinions D and D touch while making a revolution, for the purpose of preventing the liquid from escaping, which is very material.

H is a port leading from the space It to the space It.

I is a valve for regulating the size of the opening through the port II. This valve is preferably in the form of a piston-valve, as shown.

At the extremity of the shaft E is placed the cog or pinion F, On the end of the shaft and inside the cover of the pinion Fis rigidly fastened the collarf, which titsinto a bed drilled or otherwise made in the pinion F. In the cavities left between the collar and the outer rim of the pinion are placed loose rollersf, the purpose of which will be hereinafter shown.

The operation of the device can now be readily understood: The chamber and passage H are filled with water, oil, or other liquid. It is apparent now that the pinions D D can turn only as rapidly as they can force the liquid in the chamber around through the port H. If, therefore, we suppose the elevator is being hoisted up or lowered down, and that the elevator-cable should suddenly break, the elevator would descend only as rapidly as the liquid could be caused to travel around through the port Hatthewillof theoperator. In the event of the valve being closed down tight and the elevator-cable were to break, the loose pinion F would, actuated by the rack-barB, immediately commence to revolve in the opposite direction, thuscausing the rollersf to run forward and jam between the edge of the collarf and the outer rim of the pinion F, which would then cease to run independently'of the shaft E, and which, in turn, would operate the pinions D and D.

By the construction hereinbefore mentioned the pinions D and D- would remain stationary while the elevator was ascending; but in the descent the valve may be regulated so as to allow the elevator to descend at a uniform pace by simply opening the valve Wider or closing it, and then, should an accident happen, the same pace would be sustained throughout the descent, and by closing the valve tight the elevator may be stopped at any point.

The pinions D and D should be carefully dressed, so that when they mesh with each other a liquid-tightjoint is formed. When in operation, the liquid is by the pinions forced from the cavity it through the port H into the cavity h, thence, by the pistons h on the other side, through the other port, H, into the cavity h or vice versa, without any waste to the liquid. 1

By cogged pistons I would not be understood as limiting myself to the particular pin ion shown on the drawings, but as comprehending any of the various forms of rotary engaging pistons.

I am aware that the hoisting-drum of an elevator has been provided with gearing located in a liquid-chamber and a valve located and arranged to govern the flow of liquid through a passage extending from one portion of the chamber to another, and hence I make no claim to such an arrangement of parts.

hat I claim is 1. The combination, with an elevator cage or car provided with a shaft journaled therein, and having a pinion arranged to mesh with a rack, of a liquid-chamber, two rotary cogged pistons located in said chamber, one of said pistons being secured to the shaft, and a valve for regulating the flow of liquid from the inlet to the outer ends of the conduit connecting the opposite sides of the liquid-chamber, substantially as set forth.

2. The combination, with two cogged rotary pistons having motion imparted thereto by a shaft, rack, and pinion, said pistons being located in a liquid-chamber, of a valve and lever for regulating the flow of liquid from one side of the liquid-chamber to the other, substantially as set forth.

3. The combination, with the cogged rotary pistons, shaft, rack, and pinion, of a balanced valve arranged to regulate the speed of the cogged pistons, substantially as set forth.

In testimony WhereofIsign this specification in the presence of two witnesses.

' ARETUS A. WILDER.

Witnesses:

WM. M. PORTER, SAMUEL E. THoMAs. 

